The INPUT statement specifies variables in the PROC X12 DATA= or AUXDATA= data set that are to be used as regressors in the regression portion of the regARIMA model. The variables in the data set should contain the values for each observation that define the regressor. Future values of regression variables should also be included in the DATA= data set if the time series listed in the VAR statement is to be extended with regARIMA forecasts. Multiple INPUT statements can be specified. If a MDLINFOIN= data set is not specified in the PROC X12 statement, then all variables listed in the INPUT statements are applied to all BY groups and all time series that are processed. If a MDLINFOIN= data set is specified, then the INPUT statements apply only if no regression information for the BY group and series is available in the MDLINFOIN= data set.
The following options can appear in the INPUT statement:
enables a user-defined variable to be processed in the same manner as a U.S. Census predefined variable. value can be AO, CONSTANT, EASTER, HOLIDAY, LABOR, LOM, LOMSTOCK, LOQ, LPYEAR, LS, RP, SCEASTER, SEASONAL, TC, TD, TDSTOCK, THANKS, or USER. For details about the USERTYPE= option, see the USERTYPE= option in the section REGRESSION Statement.